Rivet-slitting machine



Feb. 24, 1931. E B, P N 1,793,647

RIVET SLITTING MACHINE Filed March 29 1927 4 Sheets-Sheet 1 firomiy Fb. 24, 1931. E. B. STIMPSON RIVET SLITT ING MACHINE Filed March 29, 1927 4 Sheets-Sheet 2 nvmvrroze {MONEY Feb. 24, 1931 I E. B. STIMPSON 5 RIVET SLITTING MGHINE Filed March 29, 1927 4 Sheets-Sheet s Feb. 24, 1931. E. B. STIMPSON 1,793,647

RIVET SLITTING MACHINE Filed March 29, 19 27 4 Sheets-Sheet 4 gf INVENT OR (4/ WMJTORNEY Patented F eb. 24, 1931 COMPANY, O L MN W Y RK R vE'r-smrrme MACHINE Application fil ed March 2 9 1927. Serial No. 179,234;

Q This inventionrelates to a slotting machine for use in the manufacture of bifurcated rivets. r a r An object of the invention is to :provide a high speed machine capable of producing the rivets accurately and rapidly. To this end the machine embodies a cutting disc having a plurality of cutting saws mounted thereon, and includes-improved means for feedingthe Z rivets to the cutting :disc and for holding them during the cutting operation. l I

The holding means include a non-rotative anvil: and a holder resiliently pressed toward the anvil to grip the shank of the rivet between. them, a notched rotary disc serving to feed the rivetsto holding positionin front of the anvil. V r While Ihave disclosed a preferred embodiment of the invention for purposes ofillustration'it should beunderstood thatvarious Fig.2 is a side elevationof the machine (Fig. ,3 is a plan view partly in sectionof a1 portion of the machine;

Fig. 4 is a section on line .of'Fig. 7'8;

. Fig. 5 is aview similar to Fig. 4 showing j fainodification, I

Th zapplication isin parta continuation y N I H v v v V The rotation of feed disc -20 carries the rivet around thewall 2050f the tabletothe I eating. ositions/hereiris firmly'held during the cutting'operation bythe following-means. V Asliding anvil-36' is mounted on-the table be -Heath theieed'dist-QO and has its f rward end of my'cop nding application SerialNo. 5.10

195,filedfOctober25, 1921. 7

ly, the base 10. supports a tablelLupon which the rivet feeding andholding me'c'hanismi is mounted. A cutting 'diso'12 is rotated'by 13 which i 'd v ve f om P l y l y gears15 and 16. I'The cutting dischaSpro iectingfrom'its periphery a plurality of .ec-

V centric cutting'sawslf? as clearly shown f gl li g. I i f Referring to the drawings more spec'ifical 7E? o F FE CE Q ,snwrn 1B, srmrsom or BROOKLYN, NEW on- 'nssienon r0 ,nnwny' a. srnv rson The rivets are fed'to the-cutting position by] mechanism nowto be described. A rotatable post 19fit s into a support 18 mounted on ta- I ble 11,,the post carrying atitszlotver end a notched" feed-disc 2O andat its upper end an operating gear 21. FA ,cam' in the form of a segmentalWormQQ is mounted for. cooperationiwithgear 21 and is carried by shaft 23 mounted on the extreme left end of table 11 (Fig.3). Agear 24iskeyed1toshaft23 and the cutting disc.

The rivets are, supplied to themachine; through any suitable feedchute which delivers themthrough groove 25 formed in the taarm hichis pivoted to the slide at 33. YVhen V itsfloiverfenfd connected to the slide at'33 erating; with acam 3'5 'rotated by shaft '23.

formed With a taperednos'e having a semi-cythe feed discQOisin position with one of the i notches '28' registering with the slot '26 the v slide is operated to push arivet into the notch 28. l The slidefis controlled by a lever 31 mountedona stationary pivot 32' and having audits upper end carrying airoller 34 00 l "lindrical vertical notch therein nd also new 1 ing a'longitudinalslot'37cutthereinx This 1 anvil is moved forward'to the holding position p y 55' meshes. with, gear 16 to operate the shaft 23 in suitable timed relation to the movementofx the p'assage ofoneof the saws 17 from the 39, and connected at itslower endto the sliding anvil. The upper end of lever 38 carries a roller 40 riding over a cam 41 carried by shaft 23, a spring 42 serving to press the roller against the cam. A holder 43 has its work end formed like that of the anvil36, and is slidably mounted in confronting relation to the anvil. A spring 44 normally presses the holder toward anvil 36, one end of the spring being anchored to a stationary post 45 on the table', the other endbeingconnected at 46 to the end 47 of the holder The end 47 is bent to a right angle, and an adjustable contact screw 48 is mounted in the bent end. The holder is reciprocated a slide 49 lwhich extends below the table and has an arm 50 engaging the contact screw 48. The slide 49 is driven from the shaft 23 through a lever 51 mounted at its center on a stationary pivot 52 and carrying at its upper end a roller 53 cooperating with a' cam 54 on shaft 23.

During the cutting operation the rivet is resiliently held down against the cutter by a thrnstarm 59 pivoted to the table at 60 and having its operative end normally pressed downward by reason of springs 61 pulling upwardly on its rear end; The thrust arm is operated by a bell crank 62, pivoted to the table at 63 and having one of its ends 64 engaging the upper surface of the thrust arm "59 while its other end 65 extends vertically and carries a roller 66 'cooperatingwith a cam 67 on shaft 23. An adjustable contact screw 70 is'carried by a stationary part of the machine and engages the upper side of thrust This screw serves to limit the downward movement of the workarm 59 near its rear end.

ing end of the thrust arm, andkeep's it from contacting with the feed disc in case the feed mechanism should fail to place a rivet in the cutting pos1t1on.

A delivery cam. 55is mounted on the-side of the: table just below the feed disc 20. and a elean'ingfin'ger 56 closely engages the SlClBS'Of the cutting; disc with their bristles pointing in the direction of rotation'of the:

disc and" adapted to engage: the cutting saws, A second pair of brushes 58 aresnml'arly .1 mounted on the opposite side of the discjl2.

-These brushes keep gthe saw teeth cleared of metal filings, which bein magnetic, tend to adhereto the saw andfchoke it.

'(fThe feed disc 20 rotates tomove a'rivet to thefcuttting position during'theinterval after :cutting positiona nd before the other saw argIlVBS at the cutting pos tion; At the same time the anvil 36 and holder-43 are retracted from the holding position. Inthe case of anvil 36gthis is accomplished by the low part gages the contact screw 48 it pulls the holder to'the right against the tension of spring 44.

Meanwhile the thrust arm has been raised to inoperative position by cam 66 operating on bell crank 62. v

v nan the rivet has arrived at the'cutting position the anvil 36 is pushed forward and positively held in that position by engagement of the high part of cam with roller 40. At the same time the low part of cam 54 permits spring 44 toemove slide49 to the left and to press the holder 43 resiliently against the rivet positioned between the notched end of 'he holder and the anvil. At this time-the cam 67 permits 'thesprings'61 to press the thrust arm 59 down on the head of the rivet. By the combination of these parts the rivet is held firmly, yet'resiliently, during the cutting operation. w I

The further operation of the machine now causes one of the saw bladeslZ to cutaslit in the shank of the rivet in a well-knownmanner; After the passage of the saw blade the feed disc again rotates causing the rivet to ride up'cam 55 and thereby'be discharged ing another rivet to'the cutting position.

The gearing is so arranged that the feed disc 20 ismoved twice during a single rotation ofthecutter disc 12, and a fresh rivet'is in the cuttingposition each-time a saw 17 passes thelcutting position. i Likewise, the

camsjare rotated by shaft'23 in a manner, to cause the gripping of each rivet as it reaches the cutting position. The arcuate slot- 27 in A theanvil and the Vcorresponding slot in the holder permit the saw to reach the shank of the rivet while enabling the anvilandholder to rigidly support .the entirelength ofthe shank onfeach side of thecut during theoperation of slitting; I

In the species of Figg5 holder operates in themanner hereinbefore set forth, but the anvil 36f insteadof-being reciprocal is sta- The tionary, and hence the rivets mustbe carried aroun'dthe nose oft-he anvil by thefe'ed disc I @In either of thespeciesdisclosedthe anvil fmember ca'n be readily removed for'replacement-l injcase-it becomes worn or damaged, l

and is ar 'relatively" cheap part to. replace, This structure'has marked advantagesoverI the expensive rotary rivet holder against which therivets wereheld in some of the prior rivet slotting machines. 1

V The contact screw 48 isadjustab e toli i b shanks of rivets comprising a rotatable'carrier disc adapted to carry rivets with their shanks projecting from one face of the disc and their heads adjacent the other faceof the disc, means to rotate the disc step-by-step to successively advance the rivets to a work sta tion, means at the workstation to clamp the heads of the rivets,a pair of movable clamping dies at the work station adapted to clamp the shanks of the rivets in a stationaryposition independently of the carrier disc and without removing them therefrom, means operative in timed relation to the carrier disc to positively move one of said dies into clamping position, and means to yieldingly urge the other of said clamps into clamping position.

2. A machine for operating upon the shanks of rivets comprising a carrier member adapted to carry rivets with their shanks projecting from one face of the member and their heads adjacent the other face of the member, means to actuate the carrier memberstepby-step to successively advance the rivets. to

a work station, means at the work station to clamp the heads of the rivets in a stationary position a pair of movable clamping dies at the work station operable to clamp the shanks of the rivets in a stationary position independently of the carrier member and without removing them therefrom, means to positively set one of said movable clamping dies in clamping position, andmeans to set the other of said movableclamping dies in clamping position by spring pressure. I I

'3. A machine for operating upon the shanks of rivets comprising a'first clamping jaw and a second clamping jaw operable to clamp the shank ofa rivet at an'operating station; means to convey rivets successively. to the operating station said conveyor means comprising a thin member having spaces to receive short, lengths of individual rivets I shanks adjacent the heads of the rivets;

means to insert rivets in said space with the heads of the rivets ad acent one face of said thin member and with the shanks of the rivets" projecting from the other face of the thin member; means to operate both of, said clamping jaws 1n t1med relation to said conveyor means whereby such clamping jaws are moved into clamping positlon'after' the rivethasarrived at theoperating station. anc are restored to non-clamping position befor ,the

rivet starts toleave the operating station 1 spring pressed means to'clamp the head ofthe rivet against said'thin memberwhen the rivet is at the operating station; and means to actuate said head clamping means in timed relation to said conveyor means whereby said head clamping meansis moved lntoclamping positionafter arivet has arrivedat the opcrating station andis restored, o. non-clamping positionlbefore the rivet startsito leave the operatingstationxf tr cmachine LfOIQSlQttlllg the shanks of rivetscomprising a thin circular feed mem': ber positioned in asubstantially horizontal; plane and having its periphery notched-to re-' ceive rivet shanks; means to insert rivets.

head up in the notches whereby the rivets are suspended by their heads with their shanks projecting below said feed member; means to rotate said feed member step-by-step to advance the suspended rivets successively to a slotting station; means to clamp the heads of the rivets at the slotting station; and a pair of cooperative movable clamping dies operable to clamp the'shanks of the rivets at theslotting station, each of sald clamping dies being arranged to provide slots for-thepassage of a cutter blade to the shank of the rivet clamp thereby.

5. A machine for slotting the shanks of rivets comprising a rotary cutter head; cntter means projecting from a portion only ofthe periphery of said cutter head whereby in each revolution of the cutter head at least one portion thereof is active and at least one portlon thereof is idle rivet conve or means operable to engage the head ends 'ofrivets and convey them laterally to and from cutting position with the rivet shanks in the path ofsaid cutting means; means to actuatesaid and a pair of movable clamping means located between said conveyor means and said cutter head to clamp the shanks of said rivet for slotting by saidcutter means, said clamp,

ing means comprising a movable die member positively set in clamping position'and a mov- 1 abl die' member set in clamping position by spring pressure, the members beingfslotted to permit passage of the cutter means to the shank of a rivet clamp thereby. r

6. A -machine for slotting the shanks of rivets comprising a rotary c-ntter head; cutter means projecting-.fromia portion onlyv of the periphery of, said critter; whereby in each revolution of the cutter head at least one spor- Ll011 ti1Gl"()I isactr-ve and at least one portlon thereof is idle; rivet conveyor means operable to engage the head ends'of-rivets and convey them laterally to andffrom cutting positio-n'with the rivet shanks inthe path of said cutter means; meansto actuate said conveyor means in timed relation to said cutter head to advance a rivetto cutting position during an idle period of said cutter'andlleave means.

said rivet at rest during the succeeding active period of the cutter head; clamping means located between said conveyor means and said I cutter head to clamp the shank of, said rivet for slotting by said cutter means, said clamping means comprising a pair of movable die members;-' and means to movcsaid die members to and from clamping positionin timed relation with the movement of said conveyor In testimony whereof I my si' gnatnre.

EDWIN B. STIMPSON. 

